Go Back   Land Rover Forums - Land Rover Enthusiast Forum > Vehicle Line Up > Discovery II
Sign in using an external account
Register Forgot Password?
Search

Reply
 
 
 
 
LinkBack Thread Tools Search this Thread
  #1  
Old 02-08-2012, 06:30 AM
Junior Member
 
Join Date: Jan 2012
Posts: 13
Default High idle on cold start

First off no codes.... on cold start up RPMS jump to around 2k for about 1-2 sec then back to normal. It worrys me because I really dont like a cold engine running that high b4 the oil is circulated. Here are my symptoms...

RPMs jump to 2k intermittently on cold start up for 1-2 sec then back to norm
Occasionally when a/c is off idle drops and is very rough

Other possible related symptoms...
Tranny shifts hard from 1st to 2nd
Misfire on 1 and 6 codes twice when raining (new wires on order)

My research so far is leading me to check idle solenoid, IAC, MAF or possible vacume leak. Is there a step by step for checking/cleaning these items?

Any other advice would greatly be appreciated
__________________
2003 Disco II SE, 130K Miles, Runs great but seems to good to be true.....
Reply With Quote
  #2  
Old 02-08-2012, 06:55 AM
Savannah Buzz's Avatar
Super Moderator
 
Join Date: Jan 2011
Location: Savannah Georgia
Posts: 16,291
Default

No codes is an indicator that the ECU believes what it is doing is correct, based on the conditions sent to it by the sensors. So you can't always eliminate a sensor by no codes. If you have a scanner that can read raw data, soemtimes you can see values for things that don't make sense, like -40 F for coolant temp, etc.

You would probably want to clean the IACV and the throttle body first with cleaner made for the purpose, and the bore that the IACV fits into. Please resist temptation to turn or adjust the business end of the IACV. If these don't produce improvement, then move on to the MAF, cleaning it when stone cold and for good measure the can of cleaner stowed with the truck, so thermal shock is minimal. There are parts inside the MAF that heat to over 400F, so squirting them with cold spray cleaner can do bad things. Wires seem like a good idea. If you are where it is 20 degrees or less, might want to consider 5W40 Rotella oil, or similar.
__________________
Free download of RAVE and Rover shop & owner manuals (LR3 and older) in pdf: http://landroverforums.com/forum/gen...ing-lr3-57978/
Workshop/electrical/owners/overhaul/ECU for Discovery, Range Rover, Freelander, LR3, and older models


Cooling System Problems: http://landroverforums.com/forum/gen...verview-51034/
Reply With Quote
  #3  
Old 02-08-2012, 09:42 AM
Disco Mike's Avatar
Administrator
 
Join Date: Apr 2006
Location: Denver, Colorado
Posts: 25,512
Send a message via Skype™ to Disco Mike
Default

Clean out your t/body and Idle solenoid as already mentioned, get your plugs and wires installed and if still have any issues, get back to us.
__________________
Mike
Retired service manager. Member of the Solihull Society, NCLR club, SCLR and Santa Barbara 4 Wheelers.

99 D2, 3" lift, CDL with a Detroit and T.T. lockers, H.D. axles, 4:11 gears, Custom front and rear bumpers, sliders, Warn winch, and 5 HID's.

To Download the RAVE Manual, follow this link http://www.landroverresource.com/

Rover Radio issues or IPOD Adapters http://home.valornet.com/splacket/index.htm



Need Parts?
paulgrant@mac.com, or 203-770-1699
willtillery@roverguy.com, or 434-251-9331
Paul PTSchram 260-804-0458
PM Marty(Drillbit)[url]http://www.landroversonly.com/forums...o=newpm&u=5940
British Parts of Utah, http://www.bputah.com/
Lucky8, http://lucky8llc.com/
Reply With Quote
  #4  
Old 02-08-2012, 09:43 PM
Junior Member
 
Join Date: Jan 2012
Posts: 13
Default

TB, MAF and IACV Cleaned. Wires replaced with 8mm Kingbourne.

First cold startup jumps to 2k for a seconds then back to normal cold idle. It does idle much smoother and with the a/c off as smooth as butter.

I researched Idle solenoid but have yet to find out where it is located...

It does not jump to 2k every time you start it. I have also been noticing my SAI has a high pitch whistle occasionally on start up. COuld this be causing the RPM's to jump to 2k on cold start?

Any ideas?
__________________
2003 Disco II SE, 130K Miles, Runs great but seems to good to be true.....
Reply With Quote
  #5  
Old 02-08-2012, 09:59 PM
Savannah Buzz's Avatar
Super Moderator
 
Join Date: Jan 2011
Location: Savannah Georgia
Posts: 16,291
Default

Not sure you have an idle solenoid - see attached pages on engine management system. SAI pump will start making a whine , hair dryer noise, etc, when pump is on the way out. There is a disposable air filter on the pump.
Attached Files
File Type: pdf d2 engine management.pdf (1.17 MB, 28 views)
__________________
Free download of RAVE and Rover shop & owner manuals (LR3 and older) in pdf: http://landroverforums.com/forum/gen...ing-lr3-57978/
Workshop/electrical/owners/overhaul/ECU for Discovery, Range Rover, Freelander, LR3, and older models


Cooling System Problems: http://landroverforums.com/forum/gen...verview-51034/
Reply With Quote
  #6  
Old 02-09-2012, 09:10 AM
Disco Mike's Avatar
Administrator
 
Join Date: Apr 2006
Location: Denver, Colorado
Posts: 25,512
Send a message via Skype™ to Disco Mike
Default

Quote:
Originally Posted by Disco2RoverOver View Post
TB, MAF and IACV Cleaned. Wires replaced with 8mm Kingbourne.

First cold startup jumps to 2k for a seconds then back to normal cold idle. It does idle much smoother and with the a/c off as smooth as butter.

I researched Idle solenoid but have yet to find out where it is located...

It does not jump to 2k every time you start it. I have also been noticing my SAI has a high pitch whistle occasionally on start up. COuld this be causing the RPM's to jump to 2k on cold start?

Any ideas?
First, there is no IAC on a D2, only an idle solenoid which is located on the by-pass hose between the air intake hose and the manifold.
__________________
Mike
Retired service manager. Member of the Solihull Society, NCLR club, SCLR and Santa Barbara 4 Wheelers.

99 D2, 3" lift, CDL with a Detroit and T.T. lockers, H.D. axles, 4:11 gears, Custom front and rear bumpers, sliders, Warn winch, and 5 HID's.

To Download the RAVE Manual, follow this link http://www.landroverresource.com/

Rover Radio issues or IPOD Adapters http://home.valornet.com/splacket/index.htm



Need Parts?
paulgrant@mac.com, or 203-770-1699
willtillery@roverguy.com, or 434-251-9331
Paul PTSchram 260-804-0458
PM Marty(Drillbit)[url]http://www.landroversonly.com/forums...o=newpm&u=5940
British Parts of Utah, http://www.bputah.com/
Lucky8, http://lucky8llc.com/
Reply With Quote
  #7  
Old 05-03-2014, 12:33 AM
Junior Member
 
Join Date: Dec 2013
Location: Wailuku, Hawaii
Posts: 12
Default Erratic high idle at cold start

Not sure if this has been resolved but I've got a similiar problem. 2003 Disco that starts quick and easy, but the idle will immediately shoot up to 2100rpm for about 2 seconds and then dip down to 1400 and then repeats this 7 times before sitting at 1000rpm for about a minute and then down to 750 or so.... Up and down.. Up and down. New plugs, wires, just replaced the MAF, new air filter.. Replaced the Idle air control valve with a used one and nothing changes. Other than cold starting, it runs fine. A little hiccup at idel in traffic at times but no stalling or any other changes. Considering a new IACV but would apprecite some input before buying another one.
Reply With Quote
  #8  
Old 05-03-2014, 03:36 AM
Senior Member
 
Join Date: Nov 2013
Location: Las Vegas Nevada
Posts: 802
Default

Does the ses light flicker when this happens?
Reply With Quote
  #9  
Old 05-03-2014, 10:09 PM
Junior Member
 
Join Date: Dec 2013
Location: Wailuku, Hawaii
Posts: 12
Default

The green Manual mode light and the Sport Mode light came on and remained on twice but once warmed up, i turned the engine off and once restarted, they both remained off. No other lights flickering or illuminated. Both manual mode and sport mode work appropriately and so do the lights when engaged. Thanks!!
Reply With Quote
  #10  
Old 05-04-2014, 04:34 AM
Senior Member
 
Join Date: Mar 2012
Posts: 2,716
Default

probably vacuum leak.
At startup I bet your engine is about to stall
so the ECU cranks open the IAV for air to get the rpms up.

Then overcompensates and cranks the IAV closed.

That's why you get the up down up down.

Check all connections to the MAF are good - the air connections to the rubber
to the MAF are all tight.
Reply With Quote
Old 05-04-2014, 04:34 AM
 
 
 
Reply

Tags
code, cold, engine, excessively, high, idle, intermittent, land, misfire, pith, range, rover, startup, symptoms, whisltle


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Advertising

Featured Sponsors
Vendor Directory
Our Sponsors
All times are GMT -5. The time now is 03:30 PM.

Copyright © Internet Brands, Inc. All rights reserved.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014 vBulletin Solutions, Inc. All rights reserved.
SEO by vBSEO ©2010, Crawlability, Inc.
LAND ROVER and its logo are the registered trademarks of Land Rover. Land Rover is not affiliated with LandRoverForums.com.

Emails Backup